Finally came up with a solution to the yaw trim servo electrical connections. I used the 6 pin micro molex connector to create a spot to disconnect wires between the rudder and the aft fuselage. This was the best compromise I could find that was small but still allowed for a shield connection. I am not the biggest fan of molex, but they are effective sometimes where other connections are not.
Then spent a lot of time trying to fabricate a shelf for the magnetometer. All would have been great if I hadn't cut the aluminum angle too short. So I had to slide everything back a little and try again. Ultimately got it done, but not without a lot of frustration.